Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd96a4313289f2c6…

MALICIOUS

PDF

82.8 KB Created: 2021-04-14 19:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1c16d23c307e21bc0ae4512f3cb12848 SHA-1: 6a44e09c4887bf6ca69ffb54ea77feb526796be1 SHA-256: bd96a4313289f2c69a659e86bdcd14bdec1e3a7dfa631aa1f138ed279a36b2ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=how+to+find+initial+velocity+in+projectile+motion+with+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd2e08f1182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_606b8e784d05a.pdfIn PDF document text
    • http://bekasopeli.22web.org/87121773986.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/8e21bded84a67e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_5fd94a332dc0b.pdfIn PDF document text
    • http://wusator.mygamesonline.org/susogisuzowijine.pdfIn PDF document text
    • http://wopazav.22web.org/artificial_intelligence_vtu_notes.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/6720647.pdfIn PDF document text
    • https://pogiwubuwafax.weebly.com/uploads/1/3/0/7/130775808/duwexilox.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/1530057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_602d5f835685f.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/3148199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/xepozifulawabinazepof.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_816a9340ae5d47849b939083a6ffdf95.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_d16b1bb0f3844726abe68b182606fe52.pdf?index=trueIn PDF document text
    • http://gaxegumulot.rf.gd/cartoon_photo_maker_apk.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_d77c9d382b3c4bdfb0adedbb68dd14d3.pdf?index=trueIn PDF document text
    • http://woxunegomuwajor.rf.gd/automobile_engineering_book_kirpal_singh.pdfIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_878bfd099f9144359ebfa925c4215c6c.pdf?index=trueIn PDF document text
    • http://pabaxekuvo.rf.gd/73803088219.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 5508 bytes
SHA-256: a2412697f106b9b5b19c7adb37e77cbc0e638192bfbd75b304e5e556a189cc52
font_01_sfnt_off00011692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11692 11268 bytes
SHA-256: 8dfd3b4449d58ca10ebfb8cd35d49c2b59011ad6cd38e7c53d2f6952576bbe52